Any idea of what's the hold up? Implementation seems to be a real struggle.
JTA has issued an RFP for Skyway Vehicle Rehabilitation, and as part of that there's a map showing the location of the Brooklyn station as "Train Removal Location":

So my guess would be that it's been delayed for that. But if that's true then we're looking at like, two years to be able to actually build the station, unless they plan to build it during this time somehow.